the-8051-microcontroller digital-electronics question and answers -Page 3

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The 8051 Microcontroller problems

1. The I/O port that does not have a dual-purpose role is:
Options
A. port 0
B. port 1
C. port 2
D. port 3

Correct Answer: port 1

2. An alternate function of port pin P3.1 in the 8051 is:
Options
A. serial port input
B. serial port output
C. memory write strobe
D. memory read strobe

Correct Answer: serial port output

3. The internal RAM memory of the 8051 is:
Options
A. 32 bytes
B. 64 bytes
C. 128 bytes
D. 256 bytes

Correct Answer: 128 bytes

4. Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1?
Options
A. MOV @ P1, R0
B. MOV @ R0, P1
C. MOV P1, @ R0
D. MOV P1, R0

Correct Answer: MOV P1, @ R0

5. Which of the following instructions will load the value 35H into the high byte of timer 0?
Options
A. MOV TH0, #35H
B. MOV TH0, 35H
C. MOV T0, #35H
D. MOV T0, 35H

Correct Answer: MOV TH0, #35H

6. The ADC0804 has ________ resolution.
Options
A. 4-bit
B. 8-bit
C. 16-bit
D. 32-bit

Correct Answer: 8-bit

7. The I/O ports that are used as address and data for external memory are:
Options
A. ports 1 and 2
B. ports 1 and 3
C. ports 0 and 2
D. ports 0 and 3

Correct Answer: ports 0 and 2

8. To interface external EPROM memory for applications, it is necessary to demultiplex the address/data lines of the 8051.
Options
A. True
B. False

Correct Answer: True

9. The 8051 has ________ parallel I/O ports.
Options
A. 2
B. 3
C. 4
D. 5

Correct Answer: 4

10. Which of the following commands will move the number 27H into the accumulator?
Options
A. MOV A, P27
B. MOV A, #27H
C. MOV A, 27H
D. MOV A, @27

Correct Answer: MOV A, #27H

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